Fix linux build.

runtime/vm/debugger_api_impl_test.cc

Index: runtime/vm/debugger_api_impl_test.cc
===================================================================
--- runtime/vm/debugger_api_impl_test.cc	(revision 5274)
+++ runtime/vm/debugger_api_impl_test.cc	(working copy)
@@ -41,17 +41,6 @@
 }
 
 
-static char const* BPFunctionName(Dart_StackTrace trace) {
-  Dart_ActivationFrame frame;
-  Dart_Handle res = Dart_GetActivationFrame(trace, 0, &frame);
-  EXPECT_NOT_ERROR(res);
-  Dart_Handle func_name;
-  res = Dart_ActivationFrameInfo(frame, &func_name, NULL, NULL);
-  EXPECT_NOT_ERROR(res);
-  return ToCString(func_name);
-}
-
-
 static char const* BreakpointInfo(Dart_StackTrace trace) {
   static char info_str[128];
   Dart_ActivationFrame frame;
@@ -74,6 +63,7 @@
 static void PrintObjectList(Dart_Handle list, const char* prefix, bool expand) {
   intptr_t list_length = 0;
   Dart_Handle retval = Dart_ListLength(list, &list_length);
+  EXPECT_NOT_ERROR(retval);
   for (int i = 0; i + 1 < list_length; i += 2) {
     Dart_Handle name_handle = Dart_ListGetAt(list, i);
     EXPECT_NOT_ERROR(name_handle);